GEM module failure at high speed. Caused 4X4 to engage at high speed causing loss of control of vehicle. Also, during turns, causes loss of control of steering. Did some research of several Ford F150 web sites and found several complaints for similar or the same problems. Took the vehicle to the Ford dealer for repair and was told the GEM module was the culprit and that there was significant corrosion in the adjacent fuse junction panel. The service department confessed that they have had several complaints for these kinds of conditions and have had to replace many of these GEM modules and fuse panels because of leaks in the windshield or hood cowling. They further told me that unless I replaced these components and any other electrical component, at my expense, they would not warranty any repairs. After a repair bill of $1000, Ford refused to help claiming it was not a design or component part problem. My concern is the possibility of electrical failures in the future or even damage to the drive train components.

- Ooltewah, TN, USA

Water intrusion into GEM module causing failure of wipers, electric windows, interior lights and engagement of electronic 4wheel drive to work. Usually triggered after rain and lasting for days. See tsb 98231 NHTSA 603715. This is an ongoing problem.

- Lancaster, VA, USA